van Ark, B.; Broersma, L.; de Jong, G. - SOM Research Institute, Faculteit Economie en Bedrijfskunde - 1999
This paper has a twofold aim. Firstly, it presents an overview of sources of data on service innovation. We distinguish … macro-data do not measure the service innovation process itself, but mainly represent inputs in or output originating from … the innovation process. Data at the micro-level are derived from specific innovation surveys of firms and enterprises …